\documentclass{standalone}
\usepackage{tikz-cd}
\usepackage{adjustbox}
\begin{document}
\adjustbox{scale=1.5}{%
\begin{tikzcd}[sep=huge]
G \arrow{r}{\varphi} \arrow{d}{\pi} & H  \\
G/N \arrow{r}{\Phi}   & \varphi(G) \arrow{u}{\iota}
\end{tikzcd}%
}
\end{document}